- A
Move instances to the same zone to reduce network hops.
Why wrong: Instances in the same zone can use internal IPs, but the key issue is using external IPs; moving to the same zone may not help if external IPs are still used, and it reduces fault tolerance.
- B
Upgrade to larger machine types to improve network bandwidth.
Why wrong: Larger machine types provide more vCPUs and memory but do not directly reduce network latency; the latency issue is due to using external IPs.
- C
Use internal IP addresses instead of external IPs for inter-instance communication.
Internal IPs use Google's internal network, which is optimized for low latency and higher throughput within the same region, avoiding the variability of external IP routing.
- D
Set up a Cloud VPN connection between instances.
Why wrong: Cloud VPN is for connecting on-premises to GCP, not for inter-instance communication. It would add latency and complexity.
Google PCA Manage and provision cloud infrastructure Practice Question
This PCA practice question tests your understanding of manage and provision cloud infrastructure. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Your company runs a critical application on Compute Engine instances in us-central1. The application requires low latency between instances that are all in the same region. You notice that network latency between instances varies and sometimes spikes. You want to ensure consistent low-latency communication. You currently use external IP addresses for communication between instances. What should you do?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use internal IP addresses instead of external IPs for inter-instance communication.
Using internal IP addresses (RFC 1918) for inter-instance communication avoids the overhead of NAT, external routing, and potential egress bottlenecks. Traffic stays within Google's internal network fabric, reducing latency variability and eliminating spikes caused by external internet path fluctuations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Move instances to the same zone to reduce network hops.
Why it's wrong here
Instances in the same zone can use internal IPs, but the key issue is using external IPs; moving to the same zone may not help if external IPs are still used, and it reduces fault tolerance.
- ✗
Upgrade to larger machine types to improve network bandwidth.
Why it's wrong here
Larger machine types provide more vCPUs and memory but do not directly reduce network latency; the latency issue is due to using external IPs.
- ✓
Use internal IP addresses instead of external IPs for inter-instance communication.
Why this is correct
Internal IPs use Google's internal network, which is optimized for low latency and higher throughput within the same region, avoiding the variability of external IP routing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set up a Cloud VPN connection between instances.
Why it's wrong here
Cloud VPN is for connecting on-premises to GCP, not for inter-instance communication. It would add latency and complexity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume moving to the same zone or upgrading machine types will fix latency, but the root cause is the external IP routing path, not proximity or bandwidth.
Detailed technical explanation
How to think about this question
When instances communicate via external IPs, traffic is routed through the internet-facing gateway, which may traverse multiple hops and incur NAT processing. Internal IPs use Google's Andromeda virtual network stack, enabling direct VXLAN-based forwarding within the same VPC, often achieving sub-millisecond latency. In a real-world scenario, a latency-sensitive microservices mesh would use internal IPs or a VPC-native load balancer to maintain consistent performance.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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FAQ
Questions learners often ask
What does this PCA question test?
Manage and provision cloud infrastructure — This question tests Manage and provision cloud infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use internal IP addresses instead of external IPs for inter-instance communication. — Using internal IP addresses (RFC 1918) for inter-instance communication avoids the overhead of NAT, external routing, and potential egress bottlenecks. Traffic stays within Google's internal network fabric, reducing latency variability and eliminating spikes caused by external internet path fluctuations.
What should I do if I get this PCA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 25, 2026
This PCA practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCA exam.
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